EL6910 | TwinSAFE Logic

The EL6910 TwinSAFE Logic can establish up to 212 connections to other TwinSAFE devices. Several EL6910 can be cascaded in a TwinSAFE network with up to 65,535 TwinSAFE devices. The EL6910 EtherCAT Terminal features certified safety function blocks, which are configured according to the application. Safety functions such as emergency stop, safety door monitoring, two-hand control, etc. can thus easily be selected and linked. All blocks can be freely connected among each other and are complemented by operators such as AND, OR, etc.

In addition to the Safety over EtherCAT protocol, the EL6910 also supports the TwinSAFE SC technology. With TwinSAFE SC, the secured transmission of data is possible from standard EtherCAT I/Os with the identification -009x (TwinSAFE SC extension) to the EL6910 TwinSAFE Logic. The EL6910 also supports the processing of analog signals (16/32-bit, signed and unsigned). These signals are sent to the logic by standard, TwinSAFE SC or Safety over EtherCAT terminals. Analog signals can thus be analysed within the logic, checked for plausibility and subjected to a “voting”. For safety reasons, however, at least one of the data sources must be a TwinSAFE SC component. The remainder of the data can originate from other standard Bus Terminals, drive controllers or measuring transducers. With the aid of the TwinSAFE SC technology it is typically possible to achieve a safety level equivalent to PL d/Cat. 3 in accordance with EN ISO 13849-1 or SIL 2 in accordance with EN 62061 (see application guide TwinSAFE). The entire calculation and scaling are executed at the SIL 3/PL e safety level in the safety-related EL6910 TwinSAFE Logic. Certified function blocks such as ADD, SUB, MUL, DIV and also more complex ones such as Counter, Limit or Compare are available for the processing of analog signals.

The required functions are programmed via the TwinCAT Safety Editor in TwinCAT 3.1 and loaded into the EL6910 TwinSAFE Logic via the fieldbus. The EL6910 is suitable for applications according to IEC 61508:2010 SIL 3 and EN ISO 13849-1:2015 PL e.